EP3735572A1 - Indicateur de l'activité mélanopique de la lumière - Google Patents

Indicateur de l'activité mélanopique de la lumière

Info

Publication number
EP3735572A1
EP3735572A1 EP18833868.5A EP18833868A EP3735572A1 EP 3735572 A1 EP3735572 A1 EP 3735572A1 EP 18833868 A EP18833868 A EP 18833868A EP 3735572 A1 EP3735572 A1 EP 3735572A1
Authority
EP
European Patent Office
Prior art keywords
light
wavelength range
light indicator
sensing area
melanopsin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18833868.5A
Other languages
German (de)
English (en)
Inventor
Tobias BORRA
Marcel Petrus Lucassen
Dragan Sekulovski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Signify Holding BV
Original Assignee
Signify Holding BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Signify Holding BV filed Critical Signify Holding BV
Publication of EP3735572A1 publication Critical patent/EP3735572A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/12—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using wholly visual means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/12—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using wholly visual means
    • G01J1/14—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using wholly visual means using comparison with a surface of graded brightness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G01J1/0233—Handheld

Definitions

  • the invention relates to a light indicator as well as to a kit of parts comprising such light indicator.
  • melatonin a hormone that promotes sleep during night time.
  • Melatonin is a sleep supportive hormone that we only produce around (and during) our usual bedtime.
  • Light exposure during the evening and at night suppresses the natural production of melatonin.
  • non- visual responses include what is known as circadian responses (e.g. 24 h rhythms in physiology and behavior) as well as the acute effects of light (e.g. increase alertness and melatonin suppression).
  • the photo pigment present in this photo receptor is melanopsin and its action spectrum shows a peak of sensitivity at about 470-500 nm. Because of its key role, non- visual responses to light can be enhanced by exposure to short wavelengths or blue enriched white light sources. However, enhancing non- visual responses is not always desirable. It seems that there may be a negative impact of light at night on sleep quality, especially in the hours before bedtime. These findings have been linked to suppression of the melatonin hormone. Additionally, light at night is known to increase alertness, something not desirable in the hours of sleep.
  • the non-visual response resulting from activation of the melanopsin photo receptor may also be indicated as melanopic activation or melanopsin activation.
  • the present invention may have as object to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.
  • the basic idea of the invention is to provide a pigment that serves to indicate the amount of melanopic activity of a given illuminant.
  • a possible use hereof would be in the form of a so called‘melanopic activity checker’, where a checker chart can be used to get an approximation of the melanopic activity of a light source.
  • the invention may provide a‘ballpark’ estimate of the melanopic activity of a light source, allowing the user to determine whether this light source meets or exceeds a specific criterion.
  • a light indicator for use in evaluating a melanopsin active radiation, the light indicator comprising: (a) a light indicator element comprising a sensing area, wherein the light indicator element comprises a light reflecting element configured to reflect at least part of light illuminating the sensing area having one or more wavelengths selected from the wavelength range of 440-530 nm and configured to absorb at least part of light illuminating the sensing area having one or more wavelengths in the visible wavelength range outside the wavelength range of 440-530 nm; and (b) a non sensing area configured adjacent to the sensing area, wherein the non-sensing area has a neutral color having a lightness in the range corresponding to the lightness of shades of gray, preferably lightness of black to gray.
  • the evaluation may include evaluating the flux of melanopsin active radiation on the sensing area of the light indicator or a melanopic illuminance on the sensing area.
  • the term“lightness” refers to the appearance of a light-reflecting surface or object, and specifically to the brightness of the surface relative to the brightness of white.
  • the term“brightness” refers to the apparent amount of light reflected from an object (or originating from a light source).
  • lightness also known as value or tone, is a representation of variation in the perception of a color or color space's brightness. It is one of the color appearance parameters of any color appearance model. Various color models have an explicit term for this property.
  • the Munsell color model uses the term value, while the HSL color model, HCL color space and CIE Lab color space use the term lightness.
  • the lightness of“black” is by definition 0 whereas the lightness of“gray” is by definition 50, i.e. halfway between black and white, white being 100.
  • This tone of gray is universally used as the standard for gray because it is that tone of gray which is halfway between white and black.
  • a“neutral” color refers to a substantially achromatic shade of gray, meaning literally that it is without color.
  • Neutral colors have substantially no hue, substantially 0 color saturation (e.g. a chroma ⁇ 5 in CIELAB color space) and a lightness between 0 and 100 (i.e. between black and white respectively).
  • Such light indicator it is possible to assess the amount of melanopsin active radiation at a location, such as at a couch, at a desk, etc. Especially, with such light indicator it may be possible to easily detect the relative melanopic light flux, relative to the luminous flux of that light, at a specific position where the user desires to know this relative melanopic flux. With such light indicator it may also be possible to easily assess the absolute melanopic flux at a specific position where the user desires to know this flux. In this way, it can easily be detected (by a user) whether the light at such position has an amount of melanopsin active radiation above a desired threshold, for instance to stay awake, or below a desired threshold, e.g. at nocturnal times.
  • the light indicator may be a strip-like or card-like element with e.g. a spot or patch within a background, or a plurality of spots within a background. The color and/or lightness of the spot and the background can be compared. Based on a predetermined, for example calibrated, relation between e.g. lightness of an object/color and and the flux of the light incident of the object/color, a user may determine whether a threshold is passed or not, or may even quantitatively (within certain ranges) determine the flux.
  • the spot includes a specific material that is essentially selective for the melanopsin active radiation, which radiation may have essentially only intensity in the range of about 440-530, and may have a maximum in the range of about 470-500 nm.
  • the light indicator may thus be used for evaluating a melanopsin active radiation on a sensing area of the light indicator.
  • Melanopsin active radiation is especially (visible) radiation having one or more wavelengths in the range of the (absorption band(s)) in the) absorption spectrum of melanopsin.
  • the melanopsin active radiation is especially considered light having one or more wavelengths selected from the wavelength range of 440-530 nm, especially (at least) having one or more wavelengths selected from the wavelength range of 470-500 nm.
  • daylight contains such melanopsin active radiation, but the intensity and relative content thereof changes over time from low with sunset and sunrise to high at noon.
  • Melanopsin active radiation may be (visible) radiation that is absorbed by ipRGCs.
  • the luminous flux is the luminous energy per unit time emitted by a light source and is expressed in lumen.
  • the luminous flux incident on a surface may also be indicated as illuminance and is expressed in lumens per square meter or lux.
  • Both luminous flux and illuminance quantities relate to the visible spectrum in a wavelenght range of about 380-780 nm and are wavelength-weighted by the luminosity function (also referred to as the photopic sensitivity n(l)) to correlate with human brightness perception.
  • melanopic flux in the present description also referred to as flux of melanopsin active radiation
  • melanopic illuminance in the present description also referred to as the flux of melanopsin active radiation on a sensing area
  • the flux and illuminance related to the melanopsin active radiation part of the visible spectrum in a wavelenght range of about 440-530 nm, especially 470-500 nm.
  • Melanopic flux and melanopic illuminance are wavelength-weighted with the melanopic sensitivity function hi(l) as shown in figure 5A or numerically spelled out in table L2 of the WELL Building Standard vl with Q4 2017 addenda, downloadable at
  • the sensing area may e.g. have size of e.g. 4-1000 mm 2 , such as 4-500 mm 2 . Further, the sensing area may be a contiguous area. The sensing area may be symmetric or asymmetrical. For instance, the sensing area may be square or circular, though other (polygon) shapes may also be possible.
  • the sensing area is comprised by a light indicator element.
  • the light indicator comprises a light indicator element comprising the sensing area.
  • the light indicator element comprises a material that in embodiments may have a relatively low absorption, and thus a relatively high reflection, at the wavelength ranges of the melanopsin active radiation.
  • the material may in embodiments have a relatively high absorption, and thus relatively low reflection, at essentially all other wavelengths in the visible range.
  • the terms“visible”,“visible light” or“visible emission” refer to light having a wavelength in the range of about 380-780 nm.
  • the material may have a relative even absorption for all wavelengths in the visible, except for one or more wavelengths in the range of the melanopsin active radiation.
  • the absorption in the range of 470-500 nm may on average be at least two times lower than the average absorption at the other wavelengths in the visible, i.e. 380-470 nm and 500-780 nm, such as at least four times lower.
  • the absorption in the range of 440-530 nm may in average be at least two times lower than the average of the absorption at the other wavelengths in the visible, i.e. 380-440 nm and 530-780 nm.
  • the reflection in the range of 470-500 nm, even more especially in the range of 440-530 nm, may on average be at least two times higher than the average reflection at the other wavelengths in the visible, i.e. 380-470 nm and 500-780 nm, or even more especially in the ranges of 380-440 nm and 530-78 nm, such as at least four times higher, like at least eight times.
  • the light indicator element comprises a light reflecting element configured to reflect at least part of the light illuminating the sensing area having one or more wavelengths selected from the wavelength range of 440-530 nm and configured to absorb at least part of the light illuminating the sensing area having one or more wavelengths in the visible wavelength range outside the wavelength range of 440-530 nm.
  • the sensing area may be a surface of the light reflecting element.
  • the phrase“to reflect at least part of the light illuminating the sensing area having one or more wavelengths selected from the wavelength range of 440-530 nm” may e.g. imply that at this wavelength range there is a reflection band, e.g. having a full width half maximum selected from the range of 10-120 nm.
  • the light indicator may also include a plurality of sensing areas.
  • the light indicator may in embodiments include a plurality of light indicator elements.
  • the light indicator comprises a non-sensing area configured adjacent to the sensing area, wherein the non-sensing area has a black color, an off-black color or a shade of gray.
  • An off-black color is a shade of black that differs only slightly from pure black and is considered part of a neutral (achromatic) color scheme.
  • Off-black colors may be considered a subset of shades of gray, i.e. the‘darker’ subset of shades of gray. Cf.
  • the combination of sensing area and the adjacent non-sensing area may be used to evaluate the intensity of the melanopsin active radiation.
  • the background may be chosen such, that e.g. on the basis of a lightness comparison of the light reflected by the sensing area and non-sensing area, the user can e.g. evaluate whether the melanopic flux is higher or lower than a certain predetermined melanopic flux.
  • the shade of gray of the non-sensing area may be chosen such that a specific melanopic flux may lead to essentially the same lightness at the sensing area and the non sensing area.
  • the user of the light indicator can check whether at a specific position the flux is larger or lower, based on a comparison of the lightness of the sensing area with the non-sensing area. Is the lightness of the sensing area lower, then the flux is lower than the predetermined melanopic flux; is the lightness of the sensing area higher, then the flux is higher than the predetermined melanopic flux.
  • the light reflecting element has a reflection spectrum having a maximum reflection at a wavelength selected from the wavelength range of 470-500 nm.
  • the light reflecting element has a reflection spectrum having a maximum reflection at a wavelength selected from the wavelength range of 470-500 nm and a full width half maximum selected from the range of 10-120 nm.
  • the absorption outside the range of 470-500 nm is higher, such as at least two times higher than in the spectral range of 470-500 nm, and 440-530 nm, respectively.
  • the reflection in the reflection spectrum in the visible wavelength range outside the wavelength range of 440-530 nm is on average at least two times smaller than the reflection at the maximum reflection in the wavelength range of 440-530 nm.
  • the light reflecting element reflects at least part of the light illuminating the sensing area in the entire wavelength range of 470-500 nm.
  • the non-sensing area may be black, which may imply an average reflection of 4% or less.
  • average values of reflection it may especially be that at least 80% of the reflection values in the relevant wavelength range is within a +/-50% range of the average reflection percentage value, at least 80% is within the +/- 20% range. Below about 20% reflection, it may especially be that at least 80% is within the range of +/- 10% (but of course positive).
  • the reflection may be larger than 0% but is equal to or lower than 18%.
  • the non-sensing area has an average reflection in the visible wavelength range, thus including the wavelength range of 440-530 nm, selected from the range of 4-80%. Combined with the property that 80% of the reflection values in the visible wavelength range are within a range from the average reflection, this means that the non-sensing area may thus especially have a black color, an off-black color or a shade of gray up to medium and light gray. The non-sensing area may especially provide an essentially neutral background.
  • the non-sensing and sensing area are adjacent. This may imply that a distance between the areas may in embodiments be at maximum 1 mm, such as at maximum 0.5 mm.
  • the non-sensing area may in embodiments enclose the sensing area.
  • the sensing area may in embodiments be a coating or other type of depositions of the light reflecting element on the non-sensing area, where the area of the latter is larger than of the former (and thus essentially encloses the sensing area). Hence, in embodiments the non-sensing area may also be indicated as“background”.
  • the sensing area and non-sensing area may essentially be in the same plane.
  • the background has a neutral color, especially having a lightness in the range corresponding to the lightness of shades of gray.
  • the background may especially have a neutral color having a lightness between black and middle gray, or even between black and light gray.
  • neutral color also the term “achromatic color” may be applied.
  • Such neutral color may have a chroma ⁇ 5 (in CIELAB space).
  • the light reflecting element comprises a pigment.
  • the term pigment especially refers to a colored material that is non- white (in view of the herein defined absorption and/or reflectivity features) and that is essentially non- luminescent in the visible (under illumination with solar light).
  • the light reflecting element may comprise a photo luminescent material.
  • the light indicator may comprise a photo luminescent material, optionally in combination with a (black) pigment.
  • the pigment may be used to control the intensity of light that reaches the photoluminescent material.
  • the light reflecting element may comprise a pigment.
  • the pigment may be such that it shows essentially the desired spectral properties.
  • optical filters may be applied to adjust the reflection and/or absorption properties.
  • the term“pigment” may also refer to a plurality of different pigments.
  • a suitable pigment may include one or more oxide pigments, such as mixed metal oxide pigments (also known as complex inorganic color pigments).
  • Suitable metals may include one or more of cobalt, iron, trivalent chrome, tin, antimony, titanium, manganese and aluminum.
  • the pigment may be a chloride, a carbonate, an acetate, or a combination of different salts, with different (complex) anions, while having the same, or a combination of different, (metal) cations (such as a metal as indicated above).
  • the pigment comprises a copper salt.
  • copper salts may have the right color and reflect in the wavelength range of the melanopsin active radiation but (substantially) absorb in other visible wavelengths.
  • the pigment comprises one or more of basic copper carbonate, basic copper chloride, copper hydroxide, and copper(II)acetate. Also combinations thereof and/or mixed salts may be applied.
  • the pigment may in embodiments comprise Cu 2 C0 3 (0H) 2 .
  • a suitable pigment may be verdigris.
  • the light reflecting element may in embodiments be a layer (such as a coating), or a plurality of layers (such as a plurality of coatings).
  • the light reflecting element may be a pressed material, a ceramic material, a crystalline material, a polycrystalline material, etc..
  • the light reflecting element may be configured in a transmissive setup, i.e. that part of the melanopsin active light may be transmitted through the light reflecting element or the light reflecting element may essentially be non-transmissive e.g. when the absorption is high enoug, for instance by a high pigment content and/or long path length (e.g. in the case of a thick layer).
  • the light reflecting element comprises a light transmissive material, wherein the pigment is embedded in the light transmissive material, optionally together with a second pigment.
  • the pigment may be dispersed in a polymeric material, or a ceramic material or a glass material, especially a polymeric material, such as PMMA, PET, PC, etc.. Such polymeric materials may be light transmissive per se.
  • the light transmissiveness of the light reflecting element may depend upon the thickness of the light reflecting element and the concentration of the pigment in the light reflecting element.
  • a second pigment may be applied.
  • the term second pigment may especially refer to a black or white pigment, such as a black pigment, which may be used to provide different shades of the pigment (which may be bluish/green).
  • a black or white pigment such as a black pigment
  • the second pigment is black, like carbon black, or black iron oxide (Mars black), etc..
  • a single sensing area with a (surrounding) non-sensing area may be used for evaluating the flux of melanopsin active radiation.
  • a different combination of sensing area and non-sensing area may be selected to determine whether the flux is higher or lower than a predefined level.
  • the reflection of the sensing areas may be varied, and the reflection of the adjacent non-sensing areas may be kept constant, or the reflection of the sensing areas may be kept essentially constant, and the reflection of the adjacent non-sensing areas may be varied.
  • combinations may also be applied, and may be comprised in embodiments of the light indicator.
  • the light indicator may comprise a plurality of light indicator elements with respective sensing areas, wherein two or more sensing areas have mutually different reflectivities for the melanopsin active radiation having one or more wavelengths selected from the wavelength range of 440-530 nm.
  • the light indicator may comprise 2-8, like 2-6 different sensing areas, all having mutually different reflectivities for the melanopsin active radiation.
  • the respective non sensing areas may essentially be identical in reflectivity.
  • the sensing areas may especially be configured in an array, such as a linear array.
  • a plurality of sensing areas may have mutually different sensing areas.
  • the different reflectivities may e.g. be obtained, in embodiments, by different combinations of the light reflecting element and another material, such as different concentrations of the pigment in a host material, such as a polymeric material and/or different ratios of the pigment and another material.
  • the other material may be a black pigment and/or a white pigment, such as a black pigment.
  • a second pigment may be applied.
  • the term“second pigment” may also refer to a plurality of different second pigments. In this way different shades of the bluish-green pigment may be created.
  • the light indicator may have one or more of sensing areas having a light indicator element comprising a combination of a second pigment and the light reflecting element, the combination reflecting at least part of the light illuminating the sensing area and having one or more wavelengths selected from the wavelength range of 440- 530 nm.
  • a black second pigment may be applied.
  • the non-sensing areas may have mutually different shades of gray, such as different off-black colors.
  • the off-black colors may essentially be any shade between black and white.
  • a white and a black pigment may be used to obtain the desired off-black color.
  • the light indicator may comprise a plurality of light indicator elements with respective sensing areas and with non-sensing areas adjacent to the respective sensing areas, wherein two or more sensing areas have (essentially) the same reflectivities for the melanopsin active radiation having one or more wavelengths selected from the wavelength range of 440-530 nm.
  • the non-sensing areas for the two or more sensing areas have different colors selected from the group consisting of the neutral colors having a lightness in the range corresponding to the lightness of shades of gray.
  • the non-sensing areas for the two or more sensing areas may have different colors selected from the group consisting of the black color, off-black colors and shades of gray.
  • sensing areas have essentially the same or similar reflectivity for different wavelenghts in the melanopsin active radiation, such as within about 10% of an average reflectivity across the relevant wavelength range.
  • An advantage of this embodiment may be that the sensing areas may essentially all be the same which may be easier when producing the light indicator.
  • the concentration of the pigment in a binder such as a polymeric material, may be applied;
  • layered structures may be applied with layers of different material compositions, etc..
  • the sensing area(s) and the non-sensing area(s) may essentially have the same or similar roughnesses, such as wherein the area with the smaller roughness having a roughness in the range of about 70-100%, like 80-100%, like at least 90% of the roughness of the area having a higher roughness.
  • the sensing area and the non-sensing area may have surface finishes having the same or comparable glossiness, preferably visually the same glossiness, but especially at least in the same gloss category (matte, satin, semi-gloss, high- gloss).
  • the sensing area and the non-sensing area have surface finishes having comparable glossiness, preferably visually the same glossiness, but at least in the same gloss category (matte, satin, semi-gloss, high-gloss).
  • the glossinesses (of the surface finishes) of the sensing area and non-sensing area are at maximum 30 GU.
  • a combination of non-sensing area and sensing area may show under a specific flux of the melanopsin active radiation no lightness contrast but at the smallest deviating flux also the smallest lightness contrast.
  • a predetermined flux and/or qualitative indication may be attributed to a combination of non-sensing area and sensing area.
  • the light indicator may include information for evaluating the perceived difference in lightness for the one or more combinations of sensing area and non-sensing area.
  • such indications may be included in a separate manual, on a package of the light indicator, or on another package.
  • a link to such information may be provided.
  • the link may be provided as QR code or another type of (matrix) bar code.
  • kits of parts comprising the light indicator as described herein and reference information.
  • the reference information may (i) be available on one or more of the light indicator, a data carrier, and another tangible element and/or may (ii) be accessible on the internet via a reference to an internet site, wherein the reference is available on one or more of the light indicator, a data carrier, and another tangible element, and wherein the reference information contains information allowing one or more of a qualitative analysis and a quantitative analysis of the melanopic flux on a sensing area.
  • the reference information or a reference to such reference information may be available on one or more of the light indicator, a data carrier, and another tangible element.
  • the other tangible element may be selected from the group consisting of a manual of the light indicator and a package of the light indicator.
  • the other tangible element is selected from the group consisting of a manual of a lighting device and a package of a lighting device.
  • the kit of parts may (further) include a lighting device, a package of lighting device, or a package of a lighting device including such lighting device.
  • the light indicator may thus comprises a plurality of light indicator elements as defined herein, and the reference information contains information allowing a user to perform one or more of a qualitative analysis and a
  • the reference information may contain information allowing a user (after visual inspection of the combination of sensing area and non-sensing area) to perform one or more of a qualitative analysis and a quantitative analysis based on a determination by the user of a (smallest) contrast between one of the sensing areas and the adjacent non-sensing area.
  • the light indicator may e.g. be used at home, in an office, a plant, a public space, etc., and may be used to assess whether e.g. the flux of melanopsin active radiation at a certain location is as desired, or is too high, or is too low.
  • radiation herein especially refers to light having a wavelength in the visible wavelength range.
  • FIG. 2a-b schematically depict some further embodiments and variants
  • FIG. 3a-3b schematically depict some aspects
  • Figs. 4a-4d also schematically depict some aspects and embodiments
  • Fig. 5a shows the normalized absorption spectrum of the melanopsin pigment, further corrected for the transmission of the lens and interocular media of the human eye;
  • Fig. 5b shows a normalized reflection spectrum of copper acetate.
  • the schematic drawings are not necessarily to scale.
  • the invention provides e.g. a visual indicator, consisting of multiple patches (herein also indicated as light indicator elements) of a pigment on a black background, where the reflectance curve of the pigment closely resembles the absorbance of the melanopsin pigment, and the patches each are set to varying reflectance levels (e.g. 20%, 40%, 60%, 80% and 100%).
  • An accompanying table may be provided, where the user (after visual inspection of the patches) can get an indication of the overall amount of melanopic activity of the current illuminant, based on the last patch that is still discernible from the background.
  • Fig. la schematically depicts an embodiment of a light indicator 100 for use in evaluating the melanopic flux.
  • the light indicator 100 comprises a light indicator element 110 and a non-sensing area 130.
  • the light indicator element 110 comprises the sensing area 111.
  • the light indicator element 110 comprises a light reflecting element 120 configured to reflect at least part of light illuminating the sensing area 111 having one or more wavelengths selected from the wavelength range of 440-530 nm and configured to absorb at least part of light illuminating the sensing area 111 having one or more wavelengths in the visible wavelength range outside the wavelength range of 440-530 nm.
  • the non-sensing area 130 is configured adjacent to the sensing area 111, wherein the non-sensing area 130 has a black color, an off-black color or a shade of gray.
  • the light reflecting element 120 may in embodiments comprise a pigment 121, for instance one or more of basic copper carbonate, basic copper chloride, copper hydroxide, and copper(II)acetate.
  • Figs lb and lc schematically depict some variants of the light indicator element 110, for instance a layer of absorbing and reflective material, i.e. reflective in at least part of the wavelength range of 440-530 nm and absorbing over essentially the entire visible range outside the range of 440-530 nm. Within this range of 440-530 nm the light reflecting element may also absorb light, but to a lower extent, especially an essentially lower extent, than outside this range.
  • Fig. lc schematically depicts an embodiment wherein the light reflecting element 120 comprises a light transmissive material 122, wherein the pigment is embedded in the light transmissive material 122, optionally together with a second pigment.
  • the visual indicator may comprise at least one patch, where at least one of the patches will be created such that the patch will be just discernible from the background for a predetermined melanopic lux level, such as at or over 100.
  • Figs. 2a-2b schematically depict embodiments of the light indicator 100, comprising a plurality of light indicator elements 110 with respective sensing areas 111, wherein two or more sensing areas 111 have mutually different reflectivities for the melanopsin active radiation having one or more wavelengths selected from the wavelength range of 440-530 nm.
  • one or more of the light indicator elements 110 may comprise a combination of a second pigment and the light reflecting element 120, the combination having a reflection of at least part of light illuminating the sensing area 111 having the one or more wavelengths selected from the wavelength range of 440-530 nm.
  • kit of parts 1000 comprising such light indicator 100 and reference information 1400 on a carrier or a reference to such reference information 1400 on a carrier.
  • the reference information 1400 may be (i) available on one or more of the light indicator 100, see figure 2a, a data carrier 1410, see also Fig. 2a, and another tangible element 1420, see Fig.
  • Reference 1410 in Fig. 2a may e.g. be a USB stick with reference information 1400 or with a link to such reference information.
  • Reference 1420 in Fig. 2b may e.g. be a package of a lamp.
  • the current invention proposes - amongst others - a system (e.g. in the form of a‘color’ checker chart) that provides an estimation of the absolute amount of short wavelength energy (440-530 nm) in a given spectrum.
  • the chosen wavelength range corresponds to the peak sensitivity of ipRGCs.
  • Figure 3a illustrates a possible principle for the current invention in an example of execution, with a pigment with reflectance properties peaking in the 440-530 nm range, coinciding with the melanopic sensitivity curve.
  • the current invention is not limited to use with a color checker chart but could also be applied using a smart device, e.g. a smartphone or tablet.
  • the camera of the smart device acts as a sensor and provides an estimation of the amount of short wavelength energy in a given spectrum.
  • Reference A in Fig. 3a indicates the relevant wavelength band, such as about 470-500 nm;
  • reference B schematically indicates the pigment reflectance, with on the y-axis the reflectance, and on the x-axis the wavelength (nm).
  • Application of the principle of the current invention may be straightforward.
  • the melanopic activity checker When used as a color checker chart, the melanopic activity checker is held under a given illuminant. Then, by visual inspection, one can deduce the amount of melanopic activity for this spectrum.
  • the invention is not meant to provide a high precision, but instead will take a more categorical approach to give an indication of Tow melanopic activity’ vs.‘high melanopic activity’ (see the arrow in figure 3b), depending on the application.
  • An example hereof is provided in figure 3b. Two patches are provided, when the illuminant has a low melanopic activation, the two patches appear identical. When the illuminant has a higher melanopic activation however (top of figure 3b), the patch on the right appears different.
  • 3b schematically shows an embodiment of a patch usage.
  • the leftof the figure shows two pigments (black pigment and‘melanopic’ pigment) under various illuminants.
  • the right of the figure shows simplified examples of spectral power distributions, with low melanopic activation (bottom) and higher melanopic activation (top).
  • the effectiveness of a given light spectrum in suppressing melatonin production can be expressed in terms of the melanopsin effectiveness factor (MEF).
  • MEF melanopsin effectiveness factor
  • This factor is calculated by multiplying the spectral power distribution of the light emitted by a lighting system (SPD(k)) with the melanopic sensitivity function (hi(l)) divided by the product of SPD(k) and the photopic sensitivity (n(l)), normalized by the areas under the curves of hi(l) and n(l), see equation 1 (and see also e.g. WO2016146688, which is herein incorporated by reference, especially Fig. 1 from this reference and the accompanying information):
  • the above indicated summations are over the visible range of 380-780 nm.
  • the MEF for an equi-energy light source MEF EE equals 1.
  • EML Equivalent Melanopic Lux
  • references 111, 120, and 121 indicate the respective sensing areas, absorbing element, and pigments. Note that for all sensing areas the adjacent non-sensing area is identical. Hence, effectively there is in these embodiments a single non-sensing area 130 with a plurality of sensing areas 120 (i.e. l20a, l20b, l20c, l20d, ). Here, by way of example 4 sensing areas 120 are depicted. However, more or less sensing areas 120 may be used.
  • Fig 4c shows the low (curve B) and high MEF (curve A) spectrum used in the rendering in figs 4a and 4b, respectively. Both spectra are at identical lux levels (-175 lux), but differ in MEF levels.
  • the high MEF spectrum (curve A) has a MEF of 1.07, whereas the low MEF spectrum (curve B) has a MEF of 0.3.
  • the invention provides a visual indicator comprising: multiple patches of a pigment on a black background where the reflectance curve of the pigment closely resembles the absorbance of the melanopsin photoreceptor and where the patches each are set to varying reflectance levels (e.g. 20%, 40%, 60%, 80%, 100%) and; an accompanying table where the user (after visual inspection of the patches) can get an indication of the overall amount of melanopic activity of the current illuminant based on the last patch that is still discernible from the background; the indicator providing a“ballpark” estimate of the melanopic activity of a light source allowing the user to determine whether this light source meets or exceeds a specific criteria.
  • An alternative embodiment is schematically depicted in Fig.
  • the light indicator 100 comprises a plurality of light indicator elements 110 with respective sensing areas 111 and with non-sensing areas 130 adjacent to the respective sensing areas 111, wherein two or more sensing areas 111 have the same reflectivities for the melanopsin active radiation, especially having one or more wavelengths selected from the wavelength range of 440-530 nm.
  • the non-sensing areas 130 for the two or more sensing areas 111 have different colors selected from the group consisting of black color, off-black colors and shades of gray.
  • the different non-sensing areas 130 are indicated with references l30a, l30b, l30c, l30d, l30e, ..., respectively. More or less than five combinations may be applied.
  • the different shades can be obtained with different mixing ratios of a black and a white pigments.
  • the neutral color(s) having a lightness in the range corresponding to the lightness of shades of gray can be obtained with different mixing ratios of a black and a white segment.
  • Fig. 5a shows the normalized absorption spectrum of the melanopsin pigment in the human eye, corrected for the transmission of the lens and the interocular media, for a representative age and macular pigment density;
  • Fig. 5b shows a normalized reflection spectrum of copper acetate. As can be derived from the figure, the similarity to the absorption spectrum of the melanopsin photoreceptor is very good. Hence, this pigment may very well be applied in a comparative test as described herein.
  • the term“substantially” herein, such as in“substantially all light” or in “substantially consists”, will be understood by the person skilled in the art.
  • the term “substantially” may also include embodiments with“entirely”,“completely”,“all”, etc. Hence, in embodiments the adjective substantially may also be removed.
  • the term“substantially” may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%.
  • the term“comprise” includes also embodiments wherein the term“comprises” means“consists of’.
  • the term “and/or” especially relates to one or more of the items mentioned before and after“and/or”.
  • phrase“item 1 and/or item 2” and similar phrases may relate to one or more of item 1 and item 2.
  • the term “comprising” may in an embodiment refer to “consisting of' but may in another embodiment also refer to "containing at least the defined species and optionally one or more other species”.
  • the invention further applies to a device comprising one or more of the characterizing features described in the description and/or shown in the attached drawings.
  • the invention further pertains to a method or process comprising one or more of the characterizing features described in the description and/or shown in the attached drawings.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
  • Spectrometry And Color Measurement (AREA)

Abstract

L'invention concerne un indicateur lumineux (100) destiné à être utilisé pour évaluer une quantité de rayonnement actif de mélanopsine, l'indicateur lumineux (100) comprenant un élément indicateur de lumière (110) comprenant une zone de détection (111), l'élément indicateur de lumière (110) comprenant un élément réfléchissant la lumière (120) conçu pour réfléchir au moins une partie de la lumière éclairant la zone de détection (111) présentant une ou plusieurs longueur(s) d'onde choisie(s) dans la plage de longueurs d'onde d'une bande d'absorption de mélanopsine dans la plage de longueurs d'onde visibles et conçu pour absorber au moins une partie de la lumière éclairant la zone de détection (111) présentant une ou plusieurs longueur(s) d'onde dans la plage de longueurs d'onde visibles à l'extérieur de la plage de longueurs d'onde de la bande d'absorption de la mélanopsine dans la plage de longueurs d'onde visibles ; et une zone de non-détection (130) conçue adjacente à la zone de détection (111), la zone de non-détection (130) présentant une couleur achromatique présentant une luminosité dans la plage correspondant à la luminosité des nuances de gris.
EP18833868.5A 2018-01-02 2018-12-20 Indicateur de l'activité mélanopique de la lumière Withdrawn EP3735572A1 (fr)

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PCT/EP2018/086106 WO2019134841A1 (fr) 2018-01-02 2018-12-20 Indicateur de l'activité mélanopique de la lumière

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US11893758B2 (en) * 2022-01-23 2024-02-06 Verichrome Automated color calibration system for optical devices
US20240233187A1 (en) * 2021-10-18 2024-07-11 Sun's Arrow Research, Inc. Color Calibration Systems and Pipelines for Digital Images

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US11118963B2 (en) 2021-09-14
CN111527384B (zh) 2023-08-29
JP7241090B2 (ja) 2023-03-16
US20200370952A1 (en) 2020-11-26
CN111527384A (zh) 2020-08-11
JP2021508838A (ja) 2021-03-11

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